diff --git a/PHPCI/Helper/CommandExecutor.php b/PHPCI/Helper/CommandExecutor.php
index 60061404..5c64dd45 100644
--- a/PHPCI/Helper/CommandExecutor.php
+++ b/PHPCI/Helper/CommandExecutor.php
@@ -118,11 +118,12 @@ class CommandExecutor
                 return $this->rootDir . 'vendor/bin/' . $bin;
             }
 
-            // Use "which"
-            $which = trim(shell_exec('which ' . $bin));
+            // Use "where" for windows and "which" for other OS
+            $findCmd       = (strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') ? 'which' : 'where';
+            $findCmdResult = trim(shell_exec($findCmd . ' ' . $bin));
 
-            if (!empty($which)) {
-                return $which;
+            if (!empty($findCmdResult)) {
+                return $findCmdResult;
             }
         }